1973 mustang headlight problems?

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1973 mustang headlight problems?

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Answer #1 | 23/12 2013 21:44

Check the glow light relays.

Positive: 100 %

Answer #2 | 22/12 2013 13:34

Using a test light, check to see if you are getting power to the headlight connectors. With the low beams on, you should have power to one of the three slots, with the high beams on you should have power to a different one. If you have power, check the bulbs. A failed voltage regulator could have overloaded and blown them.
If you have power to the bulbs and the bulbs are good, check to be sure that the third connector is a good ground. You can do this by attaching your test light to the positive battery terminal, and checking to see if it lights when you touch the third slot If it does not, you have a bad ground, and the easiest fix is to run a new ground wire to the body.
If you do not have power to the connectors, the first thing to check is the high beam low beam switch, located on the left side of the floorboard. If it has gone bad, the headlights may not work. If that is good, the problem is most likely in the light switch in the dash